1 //==-- WebAssemblyTargetStreamer.h - WebAssembly Target Streamer -*- C++ -*-==// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 /// 9 /// \file 10 /// This file declares WebAssembly-specific target streamer classes. 11 /// These are for implementing support for target-specific assembly directives. 12 /// 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_LIB_TARGET_WEBASSEMBLY_MCTARGETDESC_WEBASSEMBLYTARGETSTREAMER_H 16 #define LLVM_LIB_TARGET_WEBASSEMBLY_MCTARGETDESC_WEBASSEMBLYTARGETSTREAMER_H 17 18 #include "llvm/BinaryFormat/Wasm.h" 19 #include "llvm/MC/MCStreamer.h" 20 #include "llvm/Support/MachineValueType.h" 21 22 namespace llvm { 23 24 class MCWasmStreamer; 25 class MCSymbolWasm; 26 27 /// WebAssembly-specific streamer interface, to implement support 28 /// WebAssembly-specific assembly directives. 29 class WebAssemblyTargetStreamer : public MCTargetStreamer { 30 public: 31 explicit WebAssemblyTargetStreamer(MCStreamer &S); 32 33 /// .local 34 virtual void emitLocal(ArrayRef<wasm::ValType> Types) = 0; 35 /// .endfunc 36 virtual void emitEndFunc() = 0; 37 /// .functype 38 virtual void emitFunctionType(const MCSymbolWasm *Sym) = 0; 39 /// .indidx 40 virtual void emitIndIdx(const MCExpr *Value) = 0; 41 /// .globaltype 42 virtual void emitGlobalType(const MCSymbolWasm *Sym) = 0; 43 /// .eventtype 44 virtual void emitEventType(const MCSymbolWasm *Sym) = 0; 45 /// .import_module 46 virtual void emitImportModule(const MCSymbolWasm *Sym, 47 StringRef ImportModule) = 0; 48 /// .import_name 49 virtual void emitImportName(const MCSymbolWasm *Sym, 50 StringRef ImportName) = 0; 51 52 protected: 53 void emitValueType(wasm::ValType Type); 54 }; 55 56 /// This part is for ascii assembly output 57 class WebAssemblyTargetAsmStreamer final : public WebAssemblyTargetStreamer { 58 formatted_raw_ostream &OS; 59 void emitSignature(const wasm::WasmSignature *Sig); 60 void emitParamList(const wasm::WasmSignature *Sig); 61 void emitReturnList(const wasm::WasmSignature *Sig); 62 63 public: 64 WebAssemblyTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS); 65 66 void emitLocal(ArrayRef<wasm::ValType> Types) override; 67 void emitEndFunc() override; 68 void emitFunctionType(const MCSymbolWasm *Sym) override; 69 void emitIndIdx(const MCExpr *Value) override; 70 void emitGlobalType(const MCSymbolWasm *Sym) override; 71 void emitEventType(const MCSymbolWasm *Sym) override; 72 void emitImportModule(const MCSymbolWasm *Sym, StringRef ImportModule) override; 73 void emitImportName(const MCSymbolWasm *Sym, StringRef ImportName) override; 74 }; 75 76 /// This part is for Wasm object output 77 class WebAssemblyTargetWasmStreamer final : public WebAssemblyTargetStreamer { 78 public: 79 explicit WebAssemblyTargetWasmStreamer(MCStreamer &S); 80 81 void emitLocal(ArrayRef<wasm::ValType> Types) override; 82 void emitEndFunc() override; 83 void emitFunctionType(const MCSymbolWasm *Sym) override {} 84 void emitIndIdx(const MCExpr *Value) override; 85 void emitGlobalType(const MCSymbolWasm *Sym) override {} 86 void emitEventType(const MCSymbolWasm *Sym) override {} 87 void emitImportModule(const MCSymbolWasm *Sym, 88 StringRef ImportModule) override {} 89 void emitImportName(const MCSymbolWasm *Sym, 90 StringRef ImportName) override {} 91 }; 92 93 /// This part is for null output 94 class WebAssemblyTargetNullStreamer final : public WebAssemblyTargetStreamer { 95 public: 96 explicit WebAssemblyTargetNullStreamer(MCStreamer &S) 97 : WebAssemblyTargetStreamer(S) {} 98 99 void emitLocal(ArrayRef<wasm::ValType>) override {} 100 void emitEndFunc() override {} 101 void emitFunctionType(const MCSymbolWasm *) override {} 102 void emitIndIdx(const MCExpr *) override {} 103 void emitGlobalType(const MCSymbolWasm *) override {} 104 void emitEventType(const MCSymbolWasm *) override {} 105 void emitImportModule(const MCSymbolWasm *, StringRef) override {} 106 void emitImportName(const MCSymbolWasm *, StringRef) override {} 107 }; 108 109 } // end namespace llvm 110 111 #endif 112